AspectLib — A Set of AOP Helpers for .NET (Built on MrAdvice)

[kalebakeits]

Hi everyone! I built a class library based on MrAdvice called AspectLib. While using MrAdvice in a project to build a simple caching aspect, it sparked a few ideas for other AOP helpers I’d find useful. Decided to turn it into a small library in case anyone else finds it helpful too.

Example usage:

[Cache]
public async Task<CachedObject> GetByIdAsync(int id)
{
    using var httpClient = new HttpClient();
    var response = await httpClient.GetAsync($"https://www.example.com/{id}");
    var content = await response.Content.ReadAsStringAsync();
    return JsonConvert.DeserializeObject<CachedObject>(content);
}

Without [Cache] the equivalent code would be:

public async Task<CachedObject> GetByIdAsync(int id)
{
    var cacheKey = $"GetByIdAsync_{id}";
    var cached = await this.cacheService.GetAsync<CachedObject>(cacheKey);
    if (cached != null)
        return cached;
    using var httpClient = new HttpClient();
    var response = await httpClient.GetAsync($"https://www.example.com/{id}");
    var content = await response.Content.ReadAsStringAsync();
    var result = JsonConvert.DeserializeObject<CachedObject>(content);
    await cacheService.SetAsync(cacheKey, result, TimeSpan.FromMinutes(30));
    return result;
}

Planned Aspect

• [Log] - log method entries, exits, and optionally execution time.
• [Retry] - retrying operations when certain exceptions are thrown, avoiding verbose retry loops scattered in code.

Open to feedback or contributions if anyone’s interested.

[MichalGrzegorzak]

Cool idea. Thanks for sharing! But I see some potential problems - what if you have other service with same method name? Would be better to accept cache Key in attribute constructor (or at least built key with class name). Also hardcoded 30 min, should be a attribute param really. But I really like it, thanks!

[picrap]

Nice ! That’s a good use of aspect programming (and also, we use internally the same advices 😉)